Two-steel screw with an extrusion connection and method for producing said screw
First Claim
1. A two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, wherein the top part is permanently connected to the cutting part in the region of the shank portion by way of impact extrusion,wherein the cutting part has a lug-like projection and the top part has a cup-shaped recess on the shank portion,wherein the lug-like projection is arranged in the cup-shaped recess and axially undercuts the top part in the region of the cup-shaped recess at least partially,wherein, in cross-section, the cup-shaped recess has an engaging profile with a plurality of engaging segments, andwherein circular segments are provided between the engaging segments.
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Accused Products
Abstract
The invention relates to a two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, the top part being permanently connected to the cutting part in the region of the shank portion by way of impact extrusion.
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Citations
7 Claims
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1. A two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, wherein the top part is permanently connected to the cutting part in the region of the shank portion by way of impact extrusion,
wherein the cutting part has a lug-like projection and the top part has a cup-shaped recess on the shank portion, wherein the lug-like projection is arranged in the cup-shaped recess and axially undercuts the top part in the region of the cup-shaped recess at least partially, wherein, in cross-section, the cup-shaped recess has an engaging profile with a plurality of engaging segments, and wherein circular segments are provided between the engaging segments.
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6. A two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, wherein the top part is permanently connected to the cutting part in the region of the shank portion by way of impact extrusion,
wherein the cutting part has a lug-like projection and the top part has a cup-shaped recess on the shank portion, wherein the lug-like projection is arranged in the cup-shaped recess and axially undercuts the top part in the region of the cup-shaped recess at least partially, wherein, in cross-section, the cup-shaped recess has an engaging profile with a plurality of engaging segments, wherein circular segments are provided between the engaging segments, and wherein the cup-shaped recess has a first radius in the region of the circular segments and has a second reducing radius which is smaller than the first radius in the region of the engaging segments.
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7. A two-steel screw comprising a top part and a cutting part, the top part consisting of a corrosion-resistant material and having a screw head and a shank portion, and the cutting part consisting of a hardenable material, wherein the top part is permanently connected to the cutting part in the region of the shank portion by way of impact extrusion,
wherein the cutting part has a lug-like projection and the top part has a cup-shaped recess on the shank portion, wherein the lug-like projection is arranged in the cup-shaped recess and axially undercuts the top part in the region of the cup-shaped recess at least partially, wherein, in cross-section, the cup-shaped recess has an engaging profile with three engaging segments.
Specification